Electric heating element.



H. O. SWOBODAl ELECTRIC HEATxNG ,ELEMENL APPLICATION YILED AUG.16,1915.

l,l?0,943 Patented Feb. 8, 1916.

` d e a *l* l l uw l .www TUA #4E/gin HOM-waffen@ e H a dum'o( f@ ff Wal/1% yg Wagm' ATTE UNITED STATES PATENT OFFICE. i

HANS OTTO SWOBODA, OF EDGEWOOD BOROUGH, PENNSYLVANIA, ASSIGNOR T THE MOFFAT STOVE COMPANY OF WESTON, LIMITED, 0F WESTON, ONTARIO, CANADA.

-ELECTRIC HEATING ELEMENT.

Specification of Letters Patent.

To ZZ whom it may concern:

Be it known that I, HANS OTTO Swoonin,y

of the borough of Edgewood, county ofAl-f legheny, State of )ennsylvania, United States oi America, a citizen of the United States of America, have invented certain new and useful Improvements in Electric Heating Elements, of whichthe following is 4 a specification.

ling of the frame.

This invention relates to heating elementsT of the type in which resistance coils are supported on a base of insulating material, and my object is to devise an easily assembled element which is easily inspected, cleaned and repaired.

I attain my object by means of a construction which may be briefiy described as follows. An open-center frame is Vprovided of "insulating material, having in its face at two opposite sides sets of grooves, each end of each groove being open to the central open- Similar sets of grooves are 'preferably formed in the other faces of said sides and two independent resistances are strung from side to side of the frameand through said grooves. Suitable holes and grooves are provided whereby the connections between said resistances and three terminals may be made at the same face of the frame. A removable deflector is provided adapted to fit within the frame and having grooves formed in one face to receive the portions of the resistances crossing the centralopening of the frame.

The element is constructed in detail substantially as hereinafter described and illustrated in the accompanying drawings in which- Figure 1 is a plan view of a heating element constructed in accordance with my invention; Fig. 2 a sectionalview on the line 11i-a in Fig. 1; Fig. 3 a tfragmentary section on the line b-b in Fig. 1; Fig. 4 a Sectional view on the line 0 0 in Fig. l; and ig. 5 a sectional view on the line d-d vin "ign 1.

In the drawings like numerals of reference indicate corresponding parts in the different figures. l y

'i is an open'centered frameiof porcelain or other suitable insulating material provided with the binding posts or terminals 2, 3 and 4. Each binding post is preferably of thefform shown in Fig, 3, which is provided with the head 'lying in the recess 6 1n the frame and is secured to the frame by the nut 7. The projecting end 8 of each 'binding post is preferably split to provide yielding fingers which are adapted to be received in sockets 9 carried by the insulating blocks 10 fastened to the supports 11 and 12 in any well known manner. In connection with this frame I preferably employ two independent resistances, the circuit of one resistance being from the binding post 2 to the binding post 3, and the circuit for the other from the binding post 2 to the binding post Jr.

In one face of the frame at opposite sides are formed the grooves 2O and 21, which grooves are preferably semi-circular and have their ends open to the central space within the frame. Similar grooves 16 and 17 are formed'in the other face of these same sides of the frame, the grooves on opposite sides breaking joint with one another as shown. Grooves 13, 22 and 23 are formed in one' face of the frame, the grooves 13 and 22 extending to the binding post 2 and the groove 23 to the binding post Je. The other end of each groove opens through one of the sides of the frame as shown.

14 is'an opening through the plate communicating with the groove 13 at one side and with a groove '15 at the other side, this groove opening through the edge of the side ot' the frame into the central space. An opening 19 is formed through the other side of the frame communicating with the groove 38 in the under face of the side of the frame Patented Feb. 8, 1916.'

and opening through the side of the frame into the central space. This opening 19 also ward the binding post 3.

y The various grooves opening through tlre sides'of the frame are so located that the heating resistances employed may be strung across the frame from side to side to form substantially parallel sections. Two resistances are employed forming a plurality of sections alternating with one another. The resistance B, whose leads are connected respectively with the binding posts 2 and 4, is led through the grooves in one side of the pla-te. The resistance A, whose leads are connected respectively with the binding posts 2 and 3, is led through the grooves 13 and opening 14 and through the grooves on the other side of the plate, linally being brought through the opening 19 and led to the binding post 3.

The exposed sections of the resistance are preferably formed of coilsas shown, the' connecting portions'lying in the grooves 1n the frame being preferably formed of uncoiled portions of the wire. In `connection With'this frame I provide a removable heat detector sulating material such as porcelain. This deiiector is preferably provided with a plurality of ribs 36 forming grooves in which the coiled sections of the resistance lie. This heat delector is preferably supported as follows. Carried by the supports 11 and y 12 is the frame 2,5, from which depend pins 26, 27 and 28 which lie in notches 29, 30 and 31 in the frame 1, and each of which is provided with a spring pressed turn button 32 adapted to swing under the frame 1 and -beneath the dei-lector 33, (see particularly Figs. 2, -land 5.) The corners 34@ of the deiiector, it will be seen, abut against fillets y 35 formed in the frame, so that the deflector is properly positioned in respect to the latter. When it is desired to remove the de- Hector from the frame it is merely neces` 1. An electric heating element comprising an open-center frame of insulating material; a continuous electric resistance strung back and forth across said frame to form a plurality of resistance sections, grooves being formed in one face of said frame to receive the Iportions of said resistance. connecting said sections; and a second continuous electric resistance strung back and forth across said frame to form a plurality of resistance sections alternating with and in the same plane as the sections of the other resistance, grooves being formed in the other face of said frame to receive the connecting portions of said second resistance.

2. An electric heating element comprising an open-center frame of insulating material; a continuous elect-ric resistance strung back and forth across said frame toform a plurality of resistance sections, grooves being formed in one face ot said frame to receive the portions of said resistance connecting said sections; a second continuous electric resistance strung back and forth aci oss said frame to form a plurality of resistance formed of electric and heat insections alternating with and in the same plane as theA sections of the other resistance, grooves being formed in the other .face of said frame to receive the connecting portions of said second resistance; a plurality of terminals connected to said frame; and leads from the terminals vto the resistances, grooves being formed in one face of said frame` tc receive said leads and holes in the frame through which leadsA may pass t0 the resistance having its connecting portions lyling in grooves at the other side of the plate.

8. An electric heating element comprising an open-center frame of insulating Inaterial; a continuous electric resistance strung back and forth across said frame to form a plurality of resistance sections, grooves being formed in one face of said frame to receive the portions of said resistance connecting saidsections; a second continuous electric resistance strung hack and forth across said frame to form a plurality of resistance sections alternating with the sections of the other resistance, grooves being formed in the other face of said frame to receive the connecting` portions of said second resistance; and a removable detlector of heat insulating material fitted into the open center of the frame beneath the resistance.

4. An electric heating element comprising an open-center frame of insulating material; a continuous electric resistance strung back and forth across said fraaie to form a plurality of resistance sections, grooves'being formed in one face of said frame to receive the portions of said resistance connecting said sections: a second continuous electric resistance strung back and forth across said frame to form a plurality of resistance Sectio.' s alternating with the sections of the other resistance, grooves being` formed in the other face of said frame to receive the connecting portions of said second resistance; a plurality of terminals connected to said frame: and leads from the terminals to the resistances. grooves beingl formed in one face of said frame to receive said leads and holes in the frame through which leads may pass to the resistance having its connecting portions lying in grooves at the other side of the plate; and a removable deflector of heat insulating material fitted into the open center of the frame beneath the resistance.

Signed at Pittsburgh, la., U. S. A.. this 16 day of June, 1915, in the presence of the two undersigned witnesses.

HANS OTT() SVOBODA. Witnesses:

. JENNIE .'loNrzs,

(i1-manovra RosnN'rHAL. 

